Clutch control



May l5, 1923.,

O. G. STARK CLUTCH CONTROL 2` sheets-sheet 1 Filed June 19.

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l NVENTDR ATTORN EY May 15, E923.

O. G. STARK CLUTCH CONTROL Filed June 19. 1922 2 Sheets-Sheet 2 INVENTOR Patented May 15, 1923i@ CLIN G. STARK, OF TUNKHANNOCK, PENNSYLVANIA.

citeren courant.

Application filed June 19, 1922. Serial No. 569,1*32A This invention relates to llordson traitons,

and has 'for its primary object, the provision ot means for holding the clutch disengaged.

1t is a well-known tact, that tractors of the above mentioned construction are `lirequently` used tor belt worlq, l

or which purpose a. 'tractor is provided with a belt pulley, and that there is no means for stoppingthe belt pulley unless the clutch is held out by hand or toot. 1t also requires two operators for starting the engine Yfor belt work, and when the tractor is to be stopped without stopping the engine, it is necessary for one man to hold the clutch disengaged.

1t is therefore the purpose of this invention to provide a device designed tor use with the clutch, and constructed to hold the clutch disengaged when the clutch arm or pedal is depressed a predetermined distan( e, the means for this purpose being automatically disengaged incident to a 'further depression of the clutch pedal.

The nature and advantages of the invention will be better understood when the following detailed description is read in connection with the accompanying drawings, the invention residing in the construction7 combination, and arrangement,oie part-s as claimed.

1n the drawings forming part ot this application, like numerals of reference indicate similar parts in the several views, and wherein Figure 1-is a view, showing `the manner ot' associating the device with the tractor.

Figure Q--is a longitudinal sectional view through the device showing the position of parts when the clutch is engaged.

Figure S-is a similar view, showing the position oi parts when the clutch is held disengaged.

Figure l--is a view showing the position of parts when the clutch is released and about to return to normal position.

Figure -is a sectional view taken on line 5-5 of Eig-ure 1.

The device forming the subject matter of the present invention comprises a casing or housing 10 which is of an elongated cesign, and 'through which housing` slides a locking bar 1i. This bar projects beyond both ends ot the housing 10 and supports a clamp 12 which designed to embrace the clutch opeiatnnN arm 13. The loolbar is also provided with a stop 14 which is arranged to engage the adjacent end oi' the housing, and thus limit Ithe movement of the bar in on@ direction. The bar 11 is provided at an appropriate point in its length with a notch 15, and directly at the rear ot this notch7 the bar is provided with-an enlarged cam-like surface or portion 16, the purpose ot which will be presently described.

ivoted within the housing directly above the bar is a pawl 17 which has one end connected with the adjacent end ot a curved leaf spring 18, and the opposite end of this spring is suitably connected to a block or other suitable lined support 18" arranged within the housing. The pawl is arranged to overlie the notch 15 and the cam-like portion 16, and alternately cooperates with these parts to either hold the locking bar in an active position, and incidentally hold the clutch disengaged, or to etl'ect a release ot the clutch. The device in its entirety is supported at one side of the machine upon the pulley flange 19 through the instrumentality of a bracket 2O which is substantially L- shaped. This bracket may be secured to the housing 10 and the pulley flange in any suitable manner.

In practice, when the clutch arm is depressed to disengage the clutch, the bar 11 is moved through the housing 10, and as illustrated in Figure 2, one end of the pawl normally bears against the adjacent end of the bar. Consequently, as the notch of the lbar is brought directly beneath the adjacent end ot the pawl, the latter is moved under the influence or". its spring into the notch, and thereby holds theclutch disengaged without any effort on part ot' the operator.

When it is desired to release the clutch, further depression upon the clutch arm is all that is necessary, as any further movement oi? the bar 11 brings the cam-like portion 1G into use, and this cam-like portion operates to elevate the pawl, disengag,

occupies a position vdirectly at the rear of the cam-like portion 16. Consequently, when the clutch is released, it is moved to kits normal position lin the usual manner,

and thereby reverses the' direction ofY movement of the bar ll, and as the cam-lilre portion 16 is again brought into engagement with the pawl, it moves it-about its pivot .to return the pau/l to its normal position. Manitestly, this does not take place until after the notch of the bar hasnioved beyond tliet'orward end of the paivl, so that there is no possibility of thepaul interfering' Withfthe return ot the clutch.

While it is ielievedthat from the toregoing description. the nature and advan- `tages of the invention will be readily Vapparent, l vdesire to have 1t understood that l do not limit myself to what is herein shown and described, and that such changes may be resorted to when desired asrtall Within the scope of what is claimed.

What I claim is l. An attachment for tractors, comprising a housing adapted to be supported ad# jacent the clutch control arm, a locking bar movable` through the housing and termi' nally connected With said arm, .a pawl pivoted Within the housing and adapted to 4 engage said bar to hold the lat-ter in a position to maintain the clutch disengaged, laV yieldable yelement associated With said pawl, and said bar being constructed to cooperate with thepawl to effect a release..

of itself incidentto the movement of said arm as described.

2. An attachment for tractors comprise" ing a housing supported bythe tractor ad- -v'acent the clutch oaeratinw arm a loclrinoi h 9 Ps bar movable through the "housing and having one end'eonnected with said arm., Whereby the bar is moved a predetermined. distance incident to the depressionofthe armV to disengage the-clutch, a vspring.pressed vpivoted paWl operating Within' the housingand arranged to engage said bar to hold the clutch disengaged, and a cam-like portion oLiN GLfsTAnin 

